MS Access - Too Few Parameters

Hi,

New to MS Access so apologies in advance for glaring errors. I'm trying to leverage an Access template to build a database which can create and print invoices (or save as PDF).

Have a form called "SelectedOrdersToPrint" as he main menu. However when I select the invoices to save, I get "Runtime Error - Too few parameters - Expected 1" which it errors at line "Set rs = CurrentDb.OpenRecordset(strSQL, dbOpenSnapshot)"

Here's the code in question:

Private Sub cmdSaveAsPDF_Click()



    Dim qdf As DAO.QueryDef
    Dim strSQL As String
    Dim strPathName As String
    Dim blRet As Boolean
    Dim rs As Recordset
    Dim stDocName As String
    
    Dim strSavedSQL As String
    
    If Me.Dirty Then Me.Dirty = False

    stDocName = "InvTotal"
    
   
    strSQL = "SELECT Contracts.OrderID FROM Contracts WHERE (((Contracts.SelectedPrint)=True));"
    
    Set rs = CurrentDb.OpenRecordset(strSQL, dbOpenSnapshot)
    
    
    If rs.RecordCount < 1 Then
       MsgBox "Nothing found to process", vbCritical, "Error"
       Exit Sub
    End If
    
    CreateFolder CurrentProject.Path & "\Contracts"
    
    
      ' store the current SQL
        Set qdf = CurrentDb.QueryDefs("Invoices")
        strSavedSQL = qdf.SQL
        qdf.Close
        Set qdf = Nothing
    
    
    Do
    
        Set qdf = CurrentDb.QueryDefs("Invoices")
        strSQL = Left(strSavedSQL, InStr(strSavedSQL, ";") - 1) & " and (Contracts.OrderID = " & rs!OrderID & ");"
        qdf.SQL = strSQL
        qdf.Close
        Set qdf = Nothing
    
        ' put in the same folder as the database
         strPathName = CurrentProject.Path & "\Contracts\" & rs!OrderID & ".pdf"
        
        DoCmd.OutputTo acOutputReport, stDocName, acFormatPDF, strPathName

        rs.MoveNext
    
   Loop Until rs.EOF

   rs.Close
   
   Set rs = Nothing

      ' restore the  SQL
        Set qdf = CurrentDb.QueryDefs("Invoices")
        qdf.SQL = strSavedSQL
        qdf.Close
        Set qdf = Nothing


End Sub

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I've attached the Access Database I'm working on. If anyone out there can offer any guidance it'd be much appreciated.

Many thanks.